The trucking industry is designed for efficiency: modular shipping containers, standardized everything, and even sleeper cabs help maintain razor-thin margins. However, the versatility-emphasized rectangular shape of the containers isn't designed for aerodynamic efficiency - and the boxy butt of a truck leaves a lot of gas-guzzling turbulence in its wake. But even if you can't change the standard, you may be able to adapt to it - which ATDynamics has done with its TrailerTail add-on. The flaps unfold from the back to streamline air flow and save fuel, reportedly paying for themselves in under a year. When every little bit counts, a clever design like this can make a big difference.
[via Core77]